Blind fastening bolt and nut



30 July 2, 1946. n. c. BENTON 9 FASTEN Patented July 2, 1946' Du'dley'C.Benton,

San Diego, Calif., assignor and by decreeof court of one-half to MarieE. Warren, San Diego, Calif. I

' Applicati on January 22, 1944. Serial No. 519,260

relates to a bolt and nut which is arranged to. be secured in positionfrom one side of the objects to be connected the objects of my inventionare:

First, to provide a bolt and nut which-may be readily positioned andsecured in objects to be secured together operable from'one side only inMy invention Second, to provide a in which aportion of the nutisdistorted so that it rests against a sleeve surrounding the bolt and aportion of the object to be secured; provide a bolt and nut of thisclass also against Third, to

which provides a substantial large surface en gagen'lentof the'nut withthe object to be secured on the opposite side'from the head of' thebolt;

Fourth, to provldea'boltand nutofthis class in which the nut is rigidlysecured andlocked against turning on the bolt whensecured in operativeposition; and I 7 Fifth, to provide a bolt and nut of this class whichis very simple and economical of construction, easy to install from oneside of the object to be secured, efficient, and durable. I

With these and other obj cts in view as will appear hereinafter, myinvention consists of certain novel features of construction,combination and arrangement of parts and portions as will be hereinafterdescribed in detail and particularly set forth in the appended claims,reference being had to the accompanying drawing, and to the charactersof reference thereon which form a part of this application in which:

Figure 1 is a side elevational view of my bolt and nut before the nut istightened into position against the object. to be secured showing aslotted headed bolt; Fig. 2 is a sectional view of the same showing ahexagon shaped headed bolt; Fig. 3 is another sectional view showing thenut in secured relation with the object to be secured and with the boltand showing a countersunk headed bolt; Fig. 4 is an end view of the boltand nut shown in Fig. 2; and Fig. 5 is an end view of the bolt and nutas shown in Fig. 3.

Similar characters of reference refer to similar parts and portionsthroughout the several views of the drawing.

The bolt I, sleeve 2 and nut 3 constitute the principal parts of myblind fastening bolt and nut.

The bolt I may be any conventional bolt threaded atone end and with anytype of conventional head at its opposite end, as shown in Figs. 1, 2and 3 or the drawing. The holes P together, and

bolt and nut of this class 3 Claims. (o1. s5-2.4

in the plates P are made enough larger than the bolt body to receive thesleeve 2. The outer edge of these sleeves 2 are flat and straight, asshown in Fig. 2 of the drawing for the type of bolt head shown in Figs.1 and 2, while the sleeve 2e shown in connection with the countersunkhead is tapered at its outer end conforming to the head which the headrests againstone' side and a p'ortion'of thenut rests against theopposite side when tightened; i0

of'the bolt, as shown best in Fig.3 of the drawa ing. The inner end ofthe sleeve used in connection with all of the types of bolt heads is thesame. It is provided with an inwardly and downwardly tapered edge 2a andwith a small 'weakening notch 21) near its innerside. It is arranged tolit the body of the bolt, but permits free movement of the bolt therein.Screw-threaded on the threaded end of the bolt I is the nut 3 whichslot'between the members of the is provided with a tapered portion 3aconform-C ing to the tapered portion 2a of the sleeve member 2, as shownbest in Fig. 2 of the drawing. The outer portion 30 of the nut 3 isdivided into a plurality of sections. In this case I have shown I sixforming a sectional apron which is arranged to be spread when the bolt Iis turned into the nut 3 by the bevelled portion 2a engaging thebevelled portion 3a, the portion 30 before being spread being providedwith a. bore large enough to clear the outer edges of the thread of thebolt I, thus providing surfaces for engaging the bevelled portions 3a,as shown best in Fig. 3 of the drawing, when the members forming theportion 30 are spread, as shown in Fig. 3. In order to facilitate thespreading of the portion 30 there is provided an annular groove 3dintermediate the ends of the nut. This nut i also provided with abevelled outer edge 3e to facilitate the spreading of the portion whichisadapted to engage the fin edge 20 and turn it into tight interlockedengagement with the threads of the bolt I when the bolt is securedtightly into the nut withthe portion 30 spread, as shown in Fig. 3 orthe drawing, thus securely locking the nut, sleeve and bolt rigidlytogether. The extended portion 3g of the nut 3 is threaded internally toengage the threads of the bolt I.

It is preferred to provide .the sleeve lug portions M which are arrangedto enter the portion 30, shown best in Fig. 1 of the drawing, topreventthe distortional movement of the nut 3 relatively to -the sleeve2 when the bolt I is being turned into the nut 3.

The operation of my blind fastening bolt and nut is substantially asfollows: The sleeve and nut are placed upon the bolt in a positionsubstan- 30. This nut 3 is provided with a beveled annular shoulderportion 3! upon its inner side 2 with I tially as shown in Figs.

1 and 2 of the drawing. Then the assembled unit is placed in position inthe openings P in the plates P. The sleeve 2 is enlarged slightly at itsouter end so that it provides a substantially tight fit at its outer endin the outer plate P. Then the head of the bolt I is turned which causesthe bevelled portion 3a of the nut 3 to ride upon the bevelled portion2a of the sleeve 2, thusspreading the sections of the portion 30 andgradually closing the annular slot 3d. As soon as the bevelled portion3a reaches the surface of the plate P it rides upon the surface of theplate. Just at the time when this portion 30 reaches the position asshown in Fig. 3 of the drawing, the curved portion 31 engages the finportion 20 of the sleeve 2 and and crimps it in against and into'thethreads of the bolt I,

thus providing a relatively broad fiat surface of the nut against theplate P at the one side, the bolt head at the opposite side and the slot3d is closed forming a; rigid support for the portion 30 at the sametime the sleeve 2 is locked in engagement with the threads of the bolt.

Though I have shown and described a particular construction, combinationand arrangement of parts and portions, I do not wish to be limited tothis particular construction, combination and arrangement, but desire,to include in the scope of my invention the construction, combinationand arrangement substantially as set forth in the appended claims. D

Having thus described my invention, what I claim as new" and desire to;secure by Letters Patent is:

1. In a blind fastening bolt and nut of the class described, thecombination of a bolt pro-.

nut provided with an apron slotted to provide 2.

plurality of sections with a bevelled edging adapted to conform to thebevelled edge on'said sleeve Q and provided with threads at its innerend adapted to lit the threads on said bolt, said nut provided with anexternal annular groove intermediate its ends adjacent to the inner endof said threads on said nut forming a weakened portion between said nutand said apron, said sleeve provided with a weakened portion close toits inner extremity.

2. In a blind fastening bolt and nut of the class described, thecombination of a bolt provided with a head at one end and threaded atits opposite end, a sleeve mounted on the body of said bolt with one endadapted to engage the head and its opposite end provided with a bevellededge with its longer side toward said bolt, and'a nut 'sleeve providedwith a weakened portion close to its extremity, said nut provided withan inner annular shouldered portion adjacent the threaded portionthereof adapted to engage the weakened portion of said sleeve wherebysaid sleeve is interlocked with said bolt.

3. In a blind fastening bolt and nut of the class described, thecombination with a threaded bolt, of a sleeve provided with a bevellededge arranged to fit on said bolt and extend some distance over thethreaded portion of said bolt, a nut provided with a slottedapronprovided with a bevelled edge adapted to engage the bevelled edge onsaid sleeve, the bevel on said sleeve terminating in a fin edge adaptedto be forced into the threads on said bolt with the turning of the boltinto said nut.

DUDLEY C. BENTON.

